Useful Tools Online

Home Affordability Calculator

Estimate maximum qualifying home purchase price from income, debts, down payment, and underwriting debt caps.
CFPB 28/36 Rule StandardsRuns on your device

Inputs

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Cite this calculator

Results use the inputs you enter and standard formulas documented on this page. Not professional advice.

Last reviewed: August 2026

Home Affordability Calculator. (August 2026). Useful Tools Online. https://usefultoolsonline.com/home-affordability-calculator/

Interpretation

What this means

This backs into price from a DTI cap, then subtracts taxes and insurance from the housing budget before solving for principal.

Example

Worked example

A realistic scenario showing how the calculation guides a practical decision.

At $8,000 income and 36% DTI with $500 other debt, you have about $2,380/mo for total housing before loan sizing.

Watch out

Common mistakes

  • Ignoring PMI when down payment is under 20%.
  • Using take-home pay instead of gross.

Related tools

Adjacent decisions

Debt-to-Income CalculatorCheck DTI before sizing a purchaseMortgage CalculatorEstimate payment on the affordable priceClosing Cost CalculatorAdd upfront cash to the budgetRent vs Buy CalculatorCompare buying with continuing to rent

FAQ

Frequently asked questions

How the calculation works and where its limits are.

What is the 28/36 rule for home affordability?

The 28/36 rule is a standard lending guideline stating that a household should spend a maximum of 28% of gross monthly income on housing costs (front-end DTI) and a maximum of 36% on all recurring debt payments combined (back-end DTI).

How does down payment amount increase maximum home purchase price?

Your down payment is added directly to the maximum loan principal amount you qualify to borrow based on your monthly income and debt limits. A larger down payment also reduces loan-to-value (LTV) and may eliminate private mortgage insurance (PMI).

Why do property taxes and homeowners insurance reduce purchasing power?

Lenders evaluate total monthly housing expense (PITI). Every dollar allocated to monthly property taxes and hazard insurance reduces the amount of monthly cash flow available for mortgage principal and interest.

Is this affordability calculation a formal loan commitment?

No. This calculator provides planning estimates based on your entered parameters and standard underwriting debt ratios. Actual loan pre-approval requires credit scoring, income documentation, and underwriter review.

What should I do after calculating my maximum home affordability?

Budget for estimated upfront buyer closing costs (typically 2% to 5% of home price) using our Closing Cost Calculator, and maintain a cash reserve for moving expenses and home maintenance.